Leela is Radha's younger sister. Leela is 4 years younger than Radha. Can you write Leela's age in terms of Radha's age? Take Radha's age to be x years.
Let age of Radha = x years
It is given to us that Leela is 4 years younger than Radha.
Therefore, age of Leela = (x-4) years